SD Drop Vs Tch assignment rate. This topic has 0 replies, 1 voice, and was last updated 12 years, 4 months ago by Arjun. Viewing 1 post (of 1 total) Author Posts 6th December 2011 at 05:51 #67590 ArjunGuest Hi, Can any one explain me how SD drop and TCH assignment rate dependent?? Author Posts Viewing 1 post (of 1 total) The forum ‘Telecom Design’ is closed to new topics and replies.